Respostas

2013-11-14T11:12:47-02:00
3(x-1)=2x+1
3x-3=2x+1
3x-2x=3+1
x=4                   
2013-11-14T11:38:34-02:00
3x-3=2x+1
3x-2x=3-1
resultado= 4